KR101663879B1 - Method and apparatus for pre-coding physical downlink control channel reference signal and blind decoding - Google Patents

Abstract

 The present invention proposes a method and apparatus for pre-coded physical downlink control channel (PDCCH) reference signals and blind decoding. In the design of the reference signal, the demodulation reference signal is used to demodulate the PDCCH signaling, where the PDCCH signaling is seeded on a physical downlink shared channel (PDSCH), and the demodulation reference signal is included in the control channel component. In a method for user equipment for performing blind decoding, the user equipment obtains blind decoding indication information from a base station, the blind decoding indication information includes an indication of a search space in which the user equipment performs blind decoding, A control channel component of the PDCCH, and further comprising a control channel component of a pre-coded PDCCH, and wherein in accordance with the blind decoding indication information, the blind decoding indication information is indicative of blind decoding indication information And performs blind decoding by the number of times.

Description

METHOD AND APPARATUS FOR PRE-CODING PHYSICAL DOWNLINK CONTROL CHANNEL REFERENCE SIGNAL AND BLIND DECODING BACKGROUND OF THE INVENTION Field of the Invention [0001]

This disclosure relates to a physical downlink control channel (PDCCH), and more particularly, to a method and apparatus for pre-coded PDCCH reference signals and blind decoding that are specific to user equipment.

First, three OFDM symbols of a subframe are occupied by a conventional PDCCH (Physical Downlink Control Channel), and the total bandwidth of the system is occupied by these three OFDM symbols. For conventional PDCCH signaling, channel estimation is performed with a common reference signal (CRS).

In the 3GPP R10 relay standard, it has been proposed to embed a PDCCH in a Physical Downlink Shared Channel (PDSCH) through a Frequency Division Multiplexing (FDM) scheme, and the PDCCH embedded in the PDSCH is also referred to as an R-PDCCH.

Compared to the R-PDCCH, the PDCCH based on the user equipment pre-coding, i.e. the U-PDCCH, has the following characteristics:

The link quality between the base station and the user equipment may not be as strong as that between the base station and the relay base station, and therefore, a method of ensuring BLER (BLock Error Rate) of U-PDCCH detection becomes an important issue.

 The number of UEs may well exceed the number of RNBs and the U-PDCCH allocation may be more dynamic. Therefore, the U-PDCCH resource allocation is another problem in comparison with the R-PDCCH.

 In addition, channel pre-coding is performed on the U-PDCCH, for example, through beamforming (BF), and since pre-coding not based on a codebook is not supported for CRS, channel estimation for the U- . ≪ / RTI >

According to a first aspect of the present invention there is provided a method of transmitting a demodulation reference signal at a base station of a wireless communication network, the demodulation reference signal being used for demodulating PDCCH signaling, wherein the PDCCH signaling is seeded on a PDSCH, And transmitting the demodulation reference signal to the user equipment, wherein the demodulation reference signal is included in the control channel component.

According to a second aspect of the present invention there is provided a method of receiving a demodulation reference signal at a user equipment of a wireless communication network, wherein the demodulation reference signal is used to demodulate PDCCH signaling, wherein the PDCCH signaling is seeded on a PDSCH, The method includes receiving a demodulation reference signal from a base station, wherein the demodulation reference signal is included in a control channel component.

 According to a third aspect of the present invention there is provided a method of supporting user equipment in blind decoding at a base station of a wireless communication network, the method comprising providing blind decoding indication information to a user equipment, Includes an indication of the search space in which the user equipment performs blind decoding and the search space further comprises control channel components of the pre-coded PDCCH, including control channel components of the conventional PDCCH.

 According to a fourth aspect of the present invention there is provided a method of blind decoding in a user equipment of a wireless communication network, the method comprising the steps of: obtaining blind decoding indication information from a base station, wherein the blind decoding indication information indicates that the user equipment performs blind decoding Wherein the search space comprises a control channel component of a conventional PDCCH and further comprises a control channel component of a pre-coded PDCCH, and wherein the search space is represented by blind decoding indication information according to blind decoding indication information And performing blind decoding by the number of searches indicated by the blind decoding indication information in the search space.

 According to a fifth aspect of the present invention there is provided a first apparatus for transmitting a demodulation reference signal at a base station of a wireless communication network, the demodulation reference signal being used for demodulating PDCCH signaling, wherein the PDCCH signaling is seeded on a PDSCH , The first device includes a transmitter configured to transmit a demodulation reference signal to the user equipment, wherein the demodulation reference signal is included in the control channel component.

 According to a sixth aspect of the present invention there is provided a second apparatus for receiving a demodulation reference signal in a user equipment of a wireless communication network, wherein a demodulation reference signal is used to demodulate the PDCCH signaling, wherein the PDCCH signaling is applied to the PDSCH And the second device comprises a receiver configured to receive a demodulation reference signal from the base station, wherein the demodulation reference signal is included in the control channel component.

 According to a seventh aspect of the present invention there is provided a third device at a base station of a wireless communication network for supporting user equipment with blind decoding wherein the third device is configured to provide blind decoding indication information to the user equipment Wherein the blind decoding indication information comprises an indication of a search space in which the user equipment performs blind decoding, wherein the search space comprises a control channel component of a conventional PDCCH and a control channel component of a pre-coded PDCCH .

 According to an eighth aspect of the present invention there is provided a fourth apparatus for blind decoding in a user equipment of a wireless communication network, wherein the fourth apparatus comprises acquisition device-blind decoding display information configured to obtain blind decoding indication information from a base station, Wherein the user equipment comprises an indication of a search space in which the user equipment performs blind decoding and wherein the search space further comprises control channel components of a pre-coded PDCCH including control channel components of a conventional PDCCH, And a blind decoding unit configured to perform blind decoding in a search space indicated by the blind decoding indication information.

By the solutions of the present invention, a design solution for the DMRS of the U-PDCCH is proposed so that the DMRS (DeModulated Reference Signal) for demodulating the U-PDCCH becomes more dense, thereby saving the signaling overhead of the RS . In addition, in the preferred embodiment, when the user equipments perform blind decoding on the PDCCH, different versions of user equipments may perform blind decoding starting from different starting positions, i. E. Is set for the CCE resource of the occupied PDCCH, thereby further optimizing resource allocation.

Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the drawings.
Figures 1 A and 1B illustrate design patterns of demodulation reference signals for demodulating PDCCH signaling according to two embodiments of the invention, respectively.
FIG. 2 illustrates a configuration of a search sequence and a search space for blind decoding of a PDCCH according to an embodiment of the present invention.
FIG. 3 illustrates a configuration of a search sequence and a search space for blind decoding of a PDCCH according to an embodiment of the present invention.
4 illustrates a flow diagram of a system method in accordance with an embodiment of the present invention.
Figure 5 illustrates a block diagram of an apparatus according to an embodiment of the present invention.
Figure 6 illustrates a block diagram of an apparatus according to an embodiment of the present invention.
Wherein like or similar reference numerals denote the same or similar step features or devices / modules.

Figures 1 A and 1B illustrate design patterns of demodulation reference signals for demodulating PDCCH signaling according to two embodiments of the invention, respectively.

Generally, the PDCCH is transmitted to one or more Control Channel Elements (CCEs). Specifically, each CCE corresponds to a set of nine Resource Element Groups (REGs), and each REG set includes four physical REs (i.e., each CCE includes 36 fixed REs).

The mapping between the CCE and the PRB (Physical Resource Block) of the conventional PDCCH is discrete, i.e., the CCEs are distributed discrete across the frequency band. However, user equipment specific beamforming is performed on the U-PDCCH, i. E., Data is transmitted through beamforming to specific user equipment, i. E. Beamforming is narrowband oriented. Therefore, the conventional discrete mapping between CCE and PRB is not applicable to the scenario of U-PDCCH. Considering this, Applicants consider that the design of the R-PDCCH can be utilized, that is, through time division multiplexing, a first time slot (TS) is used for downlink scheduling and a second time slot is used for uplink scheduling .

For the reference signal design, the reference signal of the U-PDCCH can be generally designed with at least two approaches. That is, the CRS reference signal is reused and the demodulation reference signal is used for channel estimation of the U-PDCCH, i.e., the U-PDCCH is demodulated into the DMRS. For CRS demodulation of the U-PDCCH, the design of the R-PDCCH can be re-used, so the repeated description thereof will be omitted here. In this context, the discussion will focus on the design of the DMRS for demodulating the U-PDCCH.

The following two factors will be considered in the design of the DMRS for demodulating the U-PDCCH:

1. The minimum granularity of the U-PDCCH becomes one CCE instead of a pair of PRBs or one bundled PRBs.

2. Different DMRS densities of the PDCCH from the PCSCH may be required.

Therefore, the design of the DMRS for demodulating the U-PDCCH will be optimized to design a CCE-specific DMRS structure, i.e. each CCE includes a separate DMRS.

In a method according to this embodiment, the base station eNB is configured to send a DMRS for demodulating PDCCH signaling, wherein the PDCCH signaling is planted on a PDSCH, and the method comprises transmitting a DMRS to a user equipment (UE) , Where the DMRS is included in the CCE.

The user equipment then receives the DMRS for demodulating the PDCCH signaling, the PDCCH signaling for the PDSCH, the method for receiving the DMRS from the base station, and the DMRS is included in the CCE.

Figures 1A and 1B illustrate design patterns of demodulation reference signals for demodulating PDCCH signaling, according to two embodiments of the present invention, respectively.

In particular, in FIGS. 1A and 1B, two or three CCEs are multiplexed to the same pair of PRBs through a frequency division multiplexing method. Note that resource elements filled with oblique lines represent resource elements occupied by conventional PDCCH and resource elements filled with oblique intersection lines represent reserved resource elements for reference signals. Therefore, each CCE contains all the resource components in the range of black box lines other than the resource components retained for the DMRS. The pair of PRBs includes 12 subcarriers and 14 OFDM symbols. Note that six subcarriers are occupied by one CCE in FIG. 1A, and therefore a pair of PRBs includes two CCEs. The four subcarriers are occupied by one CCE in FIG. 1B, and therefore a pair of PRBs includes three CCEs.

The DMS design for the U-PDCCH has been described above and the processing for the user equipment to perform U-PDCCH based blind decoding will be further described below.

In conventional blind decoding techniques, the set of CCE locations from which the user equipment can detect the PDCCH may be referred to as a "search space ". In LTE, the sizes of the search space depend on the different PDCCH formats, i.e. different PDCCH levels. In addition, a separate dedicated search space and a common search space are defined, wherein the dedicated search space is specifically configured for one user equipment, and the common search space is notified to all user equipment. Note that dedicated and common search spaces may be nested for a particular UE. The sizes of the dedicated and common search spaces are listed in Table 1 below.

 level  Number of CCEs  Candidates of common search spaces  Candidates for dedicated search spaces  One  One  6  2  2  6  4  4  4  2  8  8  2  2

In the prior art, the UE performs 44 blind decoding at most on any subframe.

A conventional blind decoding mechanism will be reused for the U-PDCCH, but the following two problems will be addressed to reuse the conventional blind decoding mechanism:

1. A method for ensuring a round number of blind decoding similar to that of an R10 system; And

2. How to ensure blind decoding rules.

The present inventors therefore propose two blind decoding solutions in the present application.

First solution:

The existing PDCCH and U-PDCCH resources are combined together to form a new extended PDCCH search space applicable to R11 and higher user equipment, where all existing defined blind decoding mechanisms can be re-used only with the following modifications:

The number of searches for CCEs in the search space is

.

는 제각기 종래의 PDCCH 검색 공간에서의 CCE들의 수 및 U-PDCCH 검색 공간에서의 CCE들의 수를 나타낸다. 이 해결책은 도 2에 도해된 것과 같다. 도 2에서, 0에서 23까지 번호 매겨진 24 개의 CCE는 종래 PDCCH에 의해 점유되는 CCE들을 나타내고, 24에서 35까지 번호 매겨진 12 개의 CCE는 U-PDCCH에 의해 점유되는 CCE들을 나타낸다. 표 1에 묘사된 것처럼, 하나의 CCE는 레벨 1로 PDCCH에 의해 점유되고, 2 개의 CCE는 레벨 2로 PDCCH에 의해 점유되고, 4 개의 CCE는 레벨 4로 PDCCH에 의해 점유되고, 8 개의 CCE는 레벨 8로 PDCCH에 의해 점유된다. 각각의 레벨에서의 번호 1은 UE 특정적 CCE 검색 공간을 나타내고, 번호 1 에 선행하는 빈 칸(blank)은 공통 검색 공간을 나타낸다. 즉, 공통 검색을 위해 레벨 1의 6 개의 CCE가 있고, 공통 검색을 위해 레벨 2의 4 개의 CCE가 있고, 공통 검색을 위해 레벨 4의 4 개의 CCE가 있고, 공통 검색을 위해 레벨 8의 2 개의 CCE가 있다. 물론, UE가 (반복된 2 회를 포함하여) 44회 검색만을 전형적으로 수행하기 때문에, 모든 CCE들에 대해 블라인드 디코딩을 수행하는 것은 불가능하고, 따라서 도 2로부터 알 수 있는 것처럼 블라인드 디코딩은 CCE들의 일부분에 대해서만 수행되고, 도 2에 번호 매겨진 CCE는 사용자 장비가 사용자 장비 특정적 블라인드 디코딩을 수행하는 CCE를 나타낸다. 당업자는 제각기의 레벨들에서의 검색들의 총 횟수가 예시적이라는 것을 알 수 있다. 실제 응용에서, 네트워크 운영자는 특정 네트워크 작동 조건에 좌우되어 이들을 전체적으로 구성할 수 있다. here

Represents the number of CCEs in the conventional PDCCH search space and the number of CCEs in the U-PDCCH search space, respectively. This solution is the same as that illustrated in Fig. In FIG. 2, 24 CCEs numbered from 0 to 23 represent CCEs occupied by the conventional PDCCH, and 12 CCEs numbered from 24 to 35 represent CCEs occupied by the U-PDCCH. As depicted in Table 1, one CCE is occupied by the PDCCH at level 1, two CCEs are occupied by the PDCCH at level 2, four CCEs are occupied by the PDCCH at level 4, and eight CCEs It is occupied by the PDCCH at level 8. The number 1 at each level represents the UE specific CCE search space, and the blank preceding the number 1 represents the common search space. That is, there are six CCEs of level 1 for common search, four CCEs of level 2 for common search, four CCEs of level 4 for common search, and two CCEs of level 8 for common search There is CCE. Of course, it is not possible to perform blind decoding on all CCEs because the UE typically performs only 44 iterations (including two iterations), so that blind decoding, as can be seen from FIG. 2, The CCE numbered in Figure 2 represents a CCE where the user equipment performs user equipment specific blind decoding. Those skilled in the art will recognize that the total number of searches at each level is exemplary. In practical applications, network operators can configure them globally, depending on specific network operating conditions.

 The first solution is easy to implement. However, as can be seen from Fig. 1, the CCE of the U-PDCCH is included only at level 8, and no CCE of the U-PDCCH is included in the other levels 1, 2 and 4. This solution therefore requires that R11 and higher user equipments only use the U-PDCCH and that R11 and higher user equipments have the same priority as R10 and lower user equipments in terms of sharing conventional PDCCH resources Ranking, it can lead to imbalance of CCEs.

 Second solution:

 FIG. 3 illustrates a block diagram of a search space and a search sequence for blind decoding of a PDCCH according to another embodiment of the present invention.

에 의해, 기지국은 U-PDCCH 및 종래의 PDCCH상에서 제각기 블라인드 디코딩의 횟수들을 구성할 수 있다.

, The base station can configure the number of blind decoding times on the U-PDCCH and the conventional PDCCH, respectively.

는 제각기 종래 PDCCH에 대한 블라인드 디코딩의 횟수, 본 발명에서의 PDCCH에 대한 블라인드 디코딩의 총 횟수, 및 U-PDCCH에 대한 블라인드 디코딩의 횟수를 나타낸다. 검색 공간들은 제각기

Represents the number of blind decodings for the conventional PDCCH, the total number of blind decodings for the PDCCH in the present invention, and the number of blind decodings for the U-PDCCH. Search spaces

.

는 시작 위치를 나타내는데, 그 관련 정의들은 TS36.213 V9.2.0에서 발견될 수 있다.

이고

이다.In particular, L represents the aggregation level, i.e., levels 1, 2, 4 and 8,

Indicates the starting position, and its associated definitions can be found in TS36.213 V9.2.0.

ego

to be.

 As can be seen from Fig. 3, R11 and higher user equipments first perform blind decoding starting from the CCEs of the U-PDCCH, and if the blind decoding succeeds, then these user equipments are no longer available for CCEs of the conventional PDCCH It will not perform blind decoding. Therefore, these user equipments will not occupy any CCE resources of the conventional PDCCH.

 4 illustrates a flow diagram of a system method in accordance with an embodiment of the present invention. First, in step S40, the base station provides blind decoding indication information to the user equipment, wherein the blind decoding indication information includes an indication of a search space in which the user equipment performs blind decoding, wherein the search space includes a CCE of a conventional PDCCH And further includes a CCE of the pre-coded PDCCH.

 In yet another embodiment, the blind decoding indication information further includes an indication of a starting position in a search space in which the user equipment performs blind decoding.

 In yet another embodiment, the blind decoding indication information further includes an indication of the number of searches in the search space of the conventional PDCCH and the search space of the pre-coded PDCCH.

 In addition, the base station can explicitly or implicitly notify the user equipment of the blind decoding indication information.

 In an explicit manner, for example, the base station may send an instruction to the user equipment, which includes blind decoding indication information.

 In an implicit manner, for example, the base station may not transmit the blind decoding indication information directly, but may associate the blind decoding indication information with other system parameters. For example, blind decoding indication information may be combined with system bandwidth. In the example, the higher the bandwidth, the greater the number of searches and the search space for blind decoding. In addition, the base station can further inform the user equipment of the current search space, the starting location in the search space where the user equipment performs blind decoding, and the number of searches in the search space, in a predefined manner.

 In addition, the number of searches for the conventional PDCCH and the number of searches for the U-PDCCH can be adjusted.

 Then, in step S41, the user equipment obtains blind decoding indication information from the base station, the blind decoding indication information includes an indication of the search space in which the user equipment performs blind decoding, and the search space includes control channel components of the conventional PDCCH And a control channel component of the pre-coded PDCCH.

 Thereafter, in step S42, the user equipment performs blind decoding in the search space indicated by the blind decoding indication information according to the blind decoding indication information.

 In a preferred embodiment, the blind decoding indication information further includes an indication of the starting position in the search space in which the user equipment performs blind decoding, and therefore step S42 further comprises performing blind decoding at the starting position .

 In yet another embodiment, the blind decoding indication information further includes an indication of the number of searches in the search space of the conventional PDCCH and the search space of the pre-coded PDCCH, and step < RTI ID = 0.0 > S42 & And performing a blind decoding on the search space of the PDCCH and the search space of the pre-coded PDCCH according to the number of searches in the search space of the pre-coded PDCCH.

In yet another embodiment, the number of searches for the conventional PDCCH and the number of searches for the U-PDCCH may be adjusted.

In yet another embodiment, blind decoding indication information may be provided to the user equipment in an implicit manner, via the predefined parameters or through association with system parameters, the current search space, the user equipment performing blind decoding The start position in the search space and the number of searches in the search space. That is, the blind decoding indication information is predefined in the network, and therefore the user equipment obtains blind decoding indication information from predefined parameters. In another embodiment, when blind decoding indication information is combined with system parameters, the user equipment may obtain blind decoding indication information from system parameters.

 The present invention has been described above in terms of method flow. The present invention will be described in the following from the apparatus point of view in connection with Figs. 5 and 6, respectively.

 The first device 10 of Figure 5 is located at the base station to transmit a demodulation reference signal and the demodulation reference signal is used to demodulate the PDCCH signaling where the PDCCH signaling is planted on the PDSCH, Includes a transmitter (100) configured to transmit a demodulation reference signal to a user equipment, wherein the demodulation reference signal is included in a control channel component.

 The second device 20 of Figure 5 is located at the user equipment to receive the demodulation reference signal and the demodulation reference signal is used to demodulate the PDCCH signaling where the PDCCH signaling is planted on the PDSCH and the second device 20 Includes a receiver 200 configured to receive a demodulation reference signal from a base station, wherein the demodulation reference signal is included in a control channel component.

 The third device 30 of FIG. 6 is located at the base station to support the user equipment in blind decoding, where the third device 30 provides the providing device 300 configured to provide blind decoding indication information to the user equipment Wherein the blind decode indication information comprises an indication of a search space in which the user equipment performs blind decoding wherein the search space includes a control channel component of a conventional PDCCH and further comprises a control channel component of a pre-coded PDCCH .

 The fourth device 40 of Figure 6 is located at the user equipment to perform blind decoding and the fourth device 40 is an acquisition device 400 configured to obtain blind decoding indication information from the base station, Wherein the user equipment comprises an indication of a search space in which the blind decoding is performed, the search space further comprising a control channel component of a pre-coded PDCCH including a control channel component of a conventional PDCCH, And a blinding decoder (401) configured to perform blind decoding in a search space indicated by blind decoding display information.

 Although embodiments of the present invention have been described above, the present invention is not limited to any particular system, device, and protocol, and one of ordinary skill in the art may make various modifications or changes without departing from the scope of the present invention.

 Those skilled in the art will understand and be able to implement other changes to the disclosed embodiments, with reference to the accompanying drawings, as well as the appended claims. In the claims, the term " comprises "does not exclude another element (s) and step (s), and the term " a " In the present invention, "first" and "second" only denote names and do not indicate any sequential relationship. In an actual application of the present invention, one element may perform the functions of the plurality of technical features described in the claims. Any reference signs in the claims shall not be construed as limiting the scope of the invention.

Claims (15)

CLAIMS What is claimed is: 1. A method for transmitting a demodulation reference signal at a base station of a wireless communication network, the demodulation reference signal being used for demodulating physical downlink control channel (PDCCH) signaling, wherein the PDCCH signaling is weighted to a physical downlink shared channel (PDSCH) embedded) -,
Transmitting the demodulation reference signal to a user equipment
Lt; / RTI >
Wherein the demodulation reference signal is included in a control channel component, the control channel component (CCE) comprises a separate demodulation reference signal, the search space includes a control channel component of a conventional PDCCH, Wherein the density of the demodulation reference signal of the PDCCH is different from the density of the demodulation reference signal of the PDSCH. CLAIMS What is claimed is: 1. A method for receiving a demodulation reference signal in a user equipment of a wireless communication network, the demodulation reference signal being used for demodulating PDCCH signaling, the PDCCH signaling being addressed to a PDSCH,
Receiving the demodulation reference signal from a base station
Lt; / RTI >
Wherein the demodulation reference signal is included in a control channel component, the control channel component (CCE) comprises a separate demodulation reference signal, the search space includes a control channel component of a conventional PDCCH, Wherein the density of the demodulation reference signal of the PDCCH is different from the density of the demodulation reference signal of the PDSCH. CLAIMS What is claimed is: 1. A method of supporting user equipment in blind decoding at a base station in a wireless communication network,
Providing blind decoding indication information to the user equipment
Lt; / RTI >
Wherein the blind decoding indication information comprises an indication of a search space in which the user equipment performs the blind decoding and wherein the search space further comprises a control channel component of a pre-coded PDCCH including a control channel component of a conventional PDCCH, Wherein the blind decode indication information further comprises an indication of the search space of the conventional PDCCH and the number of searches in each of the search spaces of the pre-coded PDCCH. 4. The method of claim 3, wherein the blind decoding indication information further comprises an indication of a starting position in the search space in which the user equipment performs the blind decoding. delete 5. The method of claim 3 or 4, wherein the blind decoding display information is provided to the user equipment in an implicit manner, via predefined parameters or through association with system parameters, Wherein the user equipment notifies the start location in the search space in which the blind decoding is performed and the number of searches in the search space. 5. The method of claim 3 or 4, wherein the number of searches of the conventional PDCCH and the number of searches of the pre-coded PDCCH are adjustable. A method for blind decoding in a user equipment of a wireless communication network,
A. Obtaining blind decoding indication information from a base station, the blind decoding indication information comprising an indication of a search space in which the user equipment performs the blind decoding, the search space including a control channel component of a conventional PDCCH Further comprising a control channel component of a pre-coded PDCCH, and
B. performing the blind decoding in the search space indicated by the blind decoding indication information according to the blind decoding indication information
Wherein the blind decoding indication information further comprises an indication of the search space of the conventional PDCCH and the number of searches in each search space of the pre-coded PDCCH,
In the step B,
The blind decoding method comprising: a blind decoding step of generating blind decoding information on the search space of the PDCCH and the search space of the pre-coded PDCCH according to the search space of the PDCCH indicated by the blind decoding indication information and the number of searches in each search space of the pre- And performing decoding on the blind stream. delete 9. The apparatus of claim 8, wherein the blind decoding indication information further comprises an indication of a starting position in the search space in which the user equipment performs the blind decoding,
In the step B,
And performing the blind decoding at the starting position. 11. The method according to claim 8 or 10,
The blind decoding indication information may be provided to the user equipment in an implicit manner via predefined parameters or in combination with system parameters to determine whether the current search space and / Notifies the start position in space and / or the number of searches in the search space,
Wherein said step A further comprises obtaining said blind decoding indication information from said predefined parameters or said system parameters. CLAIMS What is claimed is: 1. A first apparatus for transmitting a demodulation reference signal at a base station of a wireless communication network, the demodulation reference signal being used for demodulating PDCCH signaling, the PDCCH signaling being received by a PDSCH,
A transmitter configured to transmit the demodulation reference signal to a user equipment;
Wherein the demodulation reference signal is included in a control channel component, the control channel component (CCE) comprises a separate demodulation reference signal, the search space includes a control channel component of a conventional PDCCH, and a pre-coded PDCCH Wherein the density of the demodulation reference signal of the PDCCH is different from the density of the demodulation reference signal of the PDSCH. A second apparatus for receiving a demodulation reference signal in a user equipment of a wireless communication network, the demodulation reference signal being used for demodulating PDCCH signaling, the PDCCH signaling being received on a PDSCH,
A receiver configured to receive the demodulation reference signal from a base station
Lt; / RTI >
Wherein the demodulation reference signal is included in a control channel component, the control channel component (CCE) comprises a separate demodulation reference signal, the search space includes a control channel component of a conventional PDCCH, Wherein the density of the demodulation reference signal of the PDCCH is different from the density of the demodulation reference signal of the PDSCH. A third apparatus at a base station of a wireless communication network for supporting user equipment in blind decoding,
A providing device configured to provide blind decoding indication information to the user equipment
Lt; / RTI >
Wherein the blind decoding indication information comprises an indication of a search space in which the user equipment performs the blind decoding and wherein the search space further comprises a control channel component of a pre-coded PDCCH including a control channel component of a conventional PDCCH, Wherein the blind decoding indication information further comprises an indication of the search space of the conventional PDCCH and the number of searches in each search space of the pre-coded PDCCH. A fourth apparatus for blind decoding in a user equipment of a wireless communication network,
An acquisition device configured to obtain blind decoding indication information from a base station, the blind decoding indication information including an indication of a search space in which the user equipment performs the blind decoding, the search space including a control channel component of a conventional PDCCH And further comprising a control channel component of a pre-coded PDCCH; And
And a blind decoding unit configured to perform the blind decoding in the search space indicated by the blind decoding indication information according to the blind decoding indication information,
Wherein the blind decoding indication information further comprises an indication of the search space of the conventional PDCCH and the number of searches in each search space of the pre-coded PDCCH,
The blinding decoder comprises:
The blind decoding method comprising: a blind decoding step of generating blind decoding information on the search space of the PDCCH and the search space of the pre-coded PDCCH according to the search space of the PDCCH indicated by the blind decoding indication information and the number of searches in each search space of the pre- And to perform decoding.

Images